Apple just sent out an email to MobileMe subscribers to let them know of some new(ish) features. The biggest bullet point is the fact that push is back.

Faster syncing with Mac and PC. Changes you make to contacts and calendars on your Mac (Address Book and iCal) or PC (Microsoft Outlook) are now automatically pushed up to the cloud every time you make an update. Likewise, changes you make on me.com, iPhone, or iPod touch are automatically pushed to your Mac or PC. As a result, your contacts and calendars update faster across all your devices. To take advantage of faster syncing, be sure you're running Mac OS X Leopard 10.5.6 (Mac) or MobileMe Control Panel 1.3 (Windows).

After a lousy launch in 2008, Apple decided to avoid associating the word "push" with Mobile Me until they could get synchronization between computers and mobile devices (iPhones, iPod touch) down to acceptable times. Looks like it's close enough now to bring the term back.

We all know that Apple's MobileMe had a difficult birth: but it's quite another thing to…
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Another new feature, iDisk file sharing, has been around since the 13th. Improved iPhone notification and syncing and better web app performance round out the improvements.

Dear MobileMe member:

Over the past few months, we have been working hard to make MobileMe the best service it can be. Here is a summary of the improvements and performance enhancements that have recently been completed.
Easy file sharing. iDisk now makes it even easier to share files that are too big to email. Simply select a file in the iDisk web app and click the Share File button to generate an email with a download link. You can also optionally add password protection and set an expiration date for the link. For more details, view this tutorial.

Faster syncing with Mac and PC. Changes you make to contacts and calendars on your Mac (Address Book and iCal) or PC (Microsoft Outlook) are now automatically pushed up to the cloud every time you make an update. Likewise, changes you make on me.com, iPhone, or iPod touch are automatically pushed to your Mac or PC. As a result, your contacts and calendars update faster across all your devices. To take advantage of faster syncing, be sure you're running Mac OS X Leopard 10.5.6 (Mac) or MobileMe Control Panel 1.3 (Windows).

Improved notifications and sync on iPhone. Reliability of new email notifications and syncing of contacts and calendar with MobileMe have both been improved. To get the best MobileMe experience on your iPhone or iPod touch, you should be running iPhone Software 2.2 or later.

Better web app performance. We have also improved the overall performance of the web apps at me.com including faster start time in Calendar and searching in Contacts. For more details, see this support article.
Remember, to take advantage of these improvements, your computers and devices must be running the latest software versions indicated above.